Network Tool

User Agent Checker

Instantly parse and identify any User Agent string. Detect browser, operating system, device type, rendering engine, and capabilities.

Your UA Detecting...
Enter a User Agent string above or click "Use Mine" to analyse your browser
Test with Common User Agents

Complete User Agent Analysis

Know exactly what's visiting your website

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Browser Detection

Identifies Chrome, Firefox, Safari, Edge, Opera, Samsung Internet, and hundreds more browsers with version numbers.

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OS & Device

Detects Windows, macOS, Linux, iOS, Android, and their versions. Identifies mobile, tablet, and desktop device types.

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Bot Detection

Identifies common web crawlers like Googlebot, Bingbot, and other automated scrapers vs real user browsers.

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Rendering Engine

Shows the underlying engine: Blink, Gecko, WebKit, or Trident — important for CSS compatibility decisions.

Frequently Asked Questions

What is a User Agent string?
A User Agent (UA) is a string sent by your browser in every HTTP request, identifying itself to web servers. It contains information about the browser, its version, the operating system, and the rendering engine.
Why do all browsers say "Mozilla"?
It's historical compatibility. Netscape Navigator used "Mozilla" and early sites checked for it. All browsers adopted it to avoid being blocked. The full story goes back to the browser wars of the 1990s.
Can I spoof my User Agent?
Yes. Browser DevTools let you override your UA in the Network conditions panel. Some extensions do this automatically. Server-side UA detection is therefore not a reliable security mechanism.
What is the difference between Blink and WebKit?
WebKit is the engine used by Safari, developed by Apple. Blink is a fork of WebKit used by Chrome, Edge, Opera, and most modern browsers, developed by Google. They share a common ancestor but have diverged significantly.